Its pretty tough mate. I mean the calculations are easy enough. And I have no coding ability, but can be done. But need to study a lot about timings, and how wolf's / algo works in general to attain atleast 100% efficiency. Only attempt to change timings once you can 1) Understand the hex to timings of CAS / RAS / MISC. And then 2) How each one plays a role in the overall picture of things. I treat it like a puzzle and was a good learning opportunity.

Is it more then just copy the timings ? : Oh boy. Maybe it will be easy for you, but for me with absolutely no knowledge of hex / coding / computer shit. Took me 32 hours, that too with all the answers already provided. But then again this is my first time doing this.
This is wolf0's custom rom performance : https://ottrbutt.com/tmp/xmrwolf-01222017.png
Here's the thread of folks showing of with custom timings : https://bitcointalk.org/index.php?topic=1775488.msg17713641#msg17713641
And heres the thread about the custom timing calculations : https://bitcointalk.org/index.php?topic=1758267.0

Good luck!